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<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>何为数据代理</title>
  <!-- 引入Vue -->
  <script type="text/javascript" src="../js/vue.js"></script>
</head>

<body>
  <!-- 数据代理:通过一个对象代理对另一个对象中属性的操作(读、写)  -->
  <script type="text/javascript">
    let obj = { x: 100 }
    let obj2 = { y: 200 }

    Object.defineProperty(obj2, 'x', {
      get() {
        return obj.x
      },
      set(value) {
        obj.x = value
      }

    })


  </script>


</body>

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